Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabcdf50413a5b34…

MALICIOUS

PDF

42.6 KB Created: 2020-08-16 01:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fb4c186a6287ebefc722b00064c9397e SHA-1: e26e4e0f726e65a67cc9bb15834a9384d3e478ed SHA-256: aabcdf50413a5b344b021280c924ff46f6d99f22f5106c83d05feb81131ac08c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a malicious link disguised as a 'Vim cheat sheet github' which redirects to a known malicious redirector. The document body is heavily obfuscated but contains the same redirect URL. The PDF also contains a large number of links to external PDFs, likely for SEO manipulation to increase visibility. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=vim+cheat+sheet+github In PDF document text
    • http://files.cldlab.com/uploads/1/3/0/8/130814205/8c0eb86d2.pdfIn PDF document text
    • http://files.williamsburgnaz.org/uploads/1/3/0/7/130776204/6505338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/ventral_hernia_patient_information.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/buzusalepimu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/tolelomaladizoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8000/8355/files/begelajitelafejuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/introduction_to_binary_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/3830296394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/webojitomuxeboxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5107/4204/files/patisise.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5357 6476 bytes
SHA-256: 17aeeb4bea776b867c57838842086098ba6e2a6755657966461c75ad04ee5f7e
font_01_sfnt_off00006941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6941 5188 bytes
SHA-256: 5ad067d145f3d95090d2f77c80421ca174ea97e94c56edc9ef0d879d7d890b5e
font_02_sfnt_off00007ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC3 10280 bytes
SHA-256: 7b6a591037920bbd5b0334d973692288d3e91ce6064b3e8e4f4f89edccc56eb3

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